Antenna



FIG. 1 is a front elevation view of an antenna, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear plan view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a front elevation view thereof, with unclaimed environment not shown; and,

FIG. 6 is a top plan view thereof, with unclaimed environment not shown.

The broken line in the figure drawings represents unclaimed environment only and forms no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 